Tuningp-Wave Interactions in an Ultracold Fermi Gas of Atoms

We have measured a $p$-wave Feshbach resonance in a single-component, ultracold Fermi gas of ${}^{\mathrm{40}}\mathrm{K}$ atoms. We have used this resonance to enhance the normally suppressed $p$-wave collision cross section to values larger than the background $s$-wave cross section between ${}^{\mathrm{40}}\mathrm{K}$ atoms in different spin states. In addition to the modification of two-body elastic processes, the resonance dramatically enhances three-body inelastic collisional loss.